Userland local agent sandbox with real-time network control dashboard
Details
- External ID
- 47365448
- Source
- HN
- Company
- —
- Product
- Userland local agent sandbox with real-time network control dashboard
- Website domain
- greywall.io
- Launched
- March 13, 2026
- Cohort
- —
- Upvotes
- 7
- Upvotes percentile
- 0.4108241082410824
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:26 p.m.
- Updated at
- Sept. 7, 2026, 9:26 p.m.
Enrichment
- Theme
- developer tools for ai agents
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Commercial product
- Normalized one-liner
- local sandbox for agents with network control
- Manually corrected
- False
Could you build this?
No Greywall requires low-level OS kernel tracing, syscall interception (e.g. eBPF, ptrace, or macOS Endpoint Security framework), and fine-grained sandbox enforcement without containers.
What it would actually take: A real implementation is written in Go or C using Linux eBPF/seccomp filters and the macOS Endpoint Security (ES) API to intercept low-level syscalls (execve, open, connect). The hard parts are building a cross-platform userland sandbox that can reliably inspect and block network packets and file I/O synchronously with sub-millisecond latency, while safely preventing bypasses. This requires deep systems programming and OS security kernel expertise.
Discussion
1 comment analyzed.
Competitors mentioned: Fence, Cubbi
Concerns raised: Network restrictions and proxy env var bypasses, macOS transparent TUN support not yet available, Complexity of transparent proxy approach
Feature requests: Full conversation observability including tool calls, Semantic firewall understanding agent intent beyond domain filtering, Credential replacement on the fly before data leaves machine
Competitors
Other products that read as similar to this one — 1046 launches clear the similarity bar, closest 8 shown.
Attention rank: #576 of 1047 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 133 days after the earliest competitor.
- Veris · hn · 2026-05-07 · 9 upvotes · similarity 0.64
- TakoVM · hn · 2026-06-30 · 6 upvotes · similarity 0.57
- Endo Familiar, an O-cap based JavaScript agent sandbox · hn · 2026-04-23 · 13 upvotes · similarity 0.57
- AgentNest, self-hosted sandboxes for AI agents · hn · 2026-07-23 · 12 upvotes · similarity 0.57
- Blast · hn · 2026-08-28 · 11 upvotes · similarity 0.56
- I Built a Sandbox for Agents · hn · 2026-01-28 · 31 upvotes · similarity 0.55
- Arga Labs: Real-world sandboxes for multi-app agents and software · yc · 2026-04-13 · 121 upvotes · similarity 0.55
- Agent-run · hn · 2026-07-12 · 8 upvotes · similarity 0.55
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a dev tools tool for Sales yet.